Find an Equivalent Equation in Polar Coordinates $$x ^ { 2 } + y ^ { 2 } = 100$$

Multiple Choice

Find an equivalent equation in polar coordinates.
- $$x ^ { 2 } + y ^ { 2 } = 100$$

A) $r = 10 \cos \theta$
B) $r = 100$
C) $r = 10 \sin \theta$
D) $r = 10$